US7656374B2 - Method for enhancing response speed of hold-typed display device - Google Patents
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- US7656374B2 US7656374B2 US11/469,888 US46988806A US7656374B2 US 7656374 B2 US7656374 B2 US 7656374B2 US 46988806 A US46988806 A US 46988806A US 7656374 B2 US7656374 B2 US 7656374B2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0435—Change or adaptation of the frame rate of the video stream
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/18—Use of a frame buffer in a display terminal, inclusive of the display panel
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
Definitions
- the present invention generally relates to methods for enhancing the response speed of hold-typed display devices, and more particularly to a method increasing the output frame rate in a way to achieve response speed enhancement.
- LCD liquid crystal display
- CTR cathode ray tube
- FIG. 1 a is a schematic diagram showing the architecture of a conventional LCD device.
- the LCD device contains a direct-lit backlight module (denoted as “LED backlight”) using multiple LEDs arranged in a number of horizontal rows (denoted as “BL 1 ,” “BL 2 ,” “BL 3 ,” and so on). Each row of LEDs is driven by a driver which in turn is controlled by a driver control circuit.
- the backlight module usually contains a diffuser so as to scatter the light beams emitted from the LEDs into uniform planar light.
- the LCD panel on the other hand, contains multiple vertically aligned data lines D 1 , D 2 , . . .
- a pixel of the LCD panel is located at the intersection of a data line and a scan line (e.g., the pixel P 1 is located at where D 1 and G 1 intersect).
- Each data line is driven by a data driver while each scan line is enabled by a gate driver.
- the data drivers and gate drivers are controlled by a control board of the LCD device.
- the brightness of a pixel (e.g., P 1 ) is determined by the backlight and the gray level of the pixel P 1 which is the result of enabling the scan line G 1 by a gate driver and then exerting a driving voltage over the data line D 1 by a data driver.
- the gray level of the pixel P 1 gradually approaches, instead of directly becomes a target gray level. Due to such a delay property of the liquid molecules, LCD device is commonly referred to as a hold-typed display device where residuals and therefore blurs in the displayed images are inevitable especially when dynamic images are presented. To solve this problem, various methods for accelerating the response speed of LCD device have been disclosed in the art.
- FIG. 1 b is a timing diagram showing the waveforms of various signals of the LCD device of FIG. 1 a .
- a technique called column inversion is adopted by the LCD device of FIG. 1 which one of the techniques to periodically reverse the polarity of the driving voltage applied to a liquid molecule without affecting its gray level so that the liquid molecule will not be damaged by a constant driving voltage applied for an extended period of time.
- the Vsync waveform shows the vertical synchronization signal from of LCD device
- G 1 ⁇ Gn waveforms show the enablement signals of the scan lines G 1 ⁇ Gn whose pulse width is determined by the horizontal synchronization signal, Hsync, of the LCD device
- D 1 waveform shows the driving voltage applied to the data line D 1
- Vlc waveform shows the voltage level of the pixel P 1
- B 1 waveform shows the control signal applied to the backlight module
- P 1 waveform shows the variation of the brightness (i.e., gray level) of the pixel P 1 .
- the pixel P 1 has a target gray level corresponding to a voltage level (hereinafter, the target voltage level) code 16 in frame N ⁇ 1 and the target voltage level code 200 in frame N. If the driving voltage code 200 is applied to the pixel P 1 during the frame N, the gray level of the pixel P 1 gradually approaches the target gray level (denoted as “Target”) as shown by the curve marked as “original.”
- a conventional acceleration technique is to apply an overdriving voltage code 220 that is larger than the original voltage level code 200 .
- the gray level of the pixel P 1 approaches the target gray level in frame N in a faster speed as shown by the curve marked as “overdriving.”
- Another conventional technique is to apply an overdriving voltage code 230 to the pixel P 1 in the first half of the time showing frame N (hereinafter, the frame time) and the driving voltage code 200 in the second half of the frame time.
- This approach requires that the frame rate being doubled from the standard 60 Hz to 120 Hz and is therefore referred to as an overdriving method of double frame rate (DFR).
- DFR double frame rate
- the gray level of the pixel P 1 approaches the target gray level in frame N in an even faster speed as shown by the curve marked as “DFR overdriving.”
- the backlight is always turned on.
- the aforementioned DFR overdriving method has proven to be effective in enhancing the response speed of the LCD device.
- the frames input into the control board in the 60-Hz frame rate are denoted in a timing sequence marked as “Input frames,” and the frames output from the control board in the 120-Hz frame rate are denoted in another timing sequence marked as “Output frames.”
- the control board outputs the data of the frame N again as data for the frame N+1 is not yet completely received by the control board.
- the control board is able to output the data of the frame N+1 from the data already collected from the first half of the input frame time and the data concurrently received in the second half of the input frame time.
- the DFR overdriving method would output the data of an input frame twice (one using overdriving voltages and one using target driving voltages). This repetition would cause some interruptions for dynamic images but these interruptions are usually so short to notice for human eyes.
- Another similar acceleration method also using DFR is to output a completely black frame in the first half of the input frame time of, say, frame N+1, and then to output the data of the frame N+1 using target driving voltages.
- a variation of the method is to output the completely black frame in the second half of the input frame time of, say, frame N+1.
- This so-called black-insertion approach has an advantage in achieving a display effect comparable to the impulse-typed display device such as CRT.
- the present invention provides a novel acceleration method to enhance the response speed of hold-typed display devices such as LCD devices.
- the major object and feature of the present invention is to increase output the frame rate to p/q (p, q are both natural numbers and p>q) times of the input frame rate.
- the present method therefore output (or scans) p output frames during q input frame times.
- the present method generates the data for the (p ⁇ q) additional output frames and inserts these transient frames at appropriate places in the output frame sequence so as to enhance the dynamic display effect of the display device.
- An embodiment of the present invention is to integrate the overdriving method with the foregoing frame rate acceleration and transient frame insertion.
- the pixels of the new frame are applied with an overdriving voltages.
- the pixels of the repeated frame are applied with their target driving voltages.
- Another embodiment of the present invention is to integrate the black-insertion method with the foregoing frame rate acceleration and transient frame insertion.
- one of every two adjacent output frames, whether it is a transient frame or not, is always replaced a completely black frame so as to simulate an impulse-typed display device.
- two consecutive ones of the three frames are applied with the target driving voltages or, further, the second one of the two is applied with a driving voltage lower than the target driving voltage so as to balance the gray level to its target level.
- the present invention can also integrate the control of the direct-lit backlight module to achieve better enhancement to the display device.
- FIG. 1 a is a schematic diagram showing the architecture of a conventional LCD device using LED as backlight.
- FIG. 1 b is a timing diagram showing the waveforms of various signals of the LCD device of FIG. 1 a.
- FIG. 1 c is a timing diagram showing the input frame sequence and the output frame sequence of a LCD device using double frame rate acceleration method.
- FIG. 1 d is a schematic diagram showing the architecture of a conventional LCD device using CCFL as backlight.
- FIG. 2 a is a timing diagram showing the input and output frame sequences according to an embodiment of the present invention where the output frame rate is increased to 1.2 times of the input frame rate.
- FIG. 2 b is a timing diagram showing the input and output frame sequences according to an embodiment of the present invention where the output frame rate is increased to 1.8 times of the input frame rate.
- FIG. 2 c is a timing diagram showing the input and output frame sequences according to three embodiments of the present invention where the output frame rate is increased to 1.5 times of the input frame rate.
- FIG. 3 is a timing diagram showing the input and output frame sequences of FIG. 2 b and the waveforms of various signals when overdriving is integrated according to an embodiment of the present invention.
- FIG. 4 a is a timing diagram showing the input and output frame sequences where the output frame rate is increased up to 2.5 times and the waveforms of various signals when black-insertion is integrated according to an embodiment of the present invention.
- FIG. 4 b is a timing diagram showing the input and output frame sequences where the output frame rate is increased up to 2.5 times and the waveforms of various signals when black-insertion is integrated according to two embodiments of the present invention.
- FIG. 5 a is a schematic diagram showing an implementation scenario of the present invention.
- FIG. 5 b is a schematic diagram showing another implementation scenario of the present invention.
- the present invention can be applied to LCD devices, plasma display devices, or organic light emitting display (OLED) devices.
- LCD devices plasma display devices, or organic light emitting display (OLED) devices.
- OLED organic light emitting display
- the major feature of the present invention is to increase the output frame rate up to p/q times of the input frame rate, where p, q are both natural number and p is greater than q (p>q). Therefore, in a period of time T where q input frames are scanned, the present invention will generate p output frames. In other words, the period T is the least common multiple of the input frame time and the output frame time.
- the present invention is therefore mainly about how to generate the additional frame (or frames).
- every input frame is repeated once in the output frames, except the every fifth frame N ⁇ 1, N+4, and so on.
- the two input frames received in the period T is frame N and frame N+1 while the three output frames in the same period can be frames N ⁇ 1, N, N (i.e., the output frame sequence marked as (A)), or frames N ⁇ 1, N, N+1 (i.e., the output frame sequence marked as (B)).
- the present embodiment generates the first output frame in the period T based on the complete data of the input frame N ⁇ 1 already received and the partial data of the input frame N concurrently received.
- the first output frame (marked as “repeat frame”), only first q/p portion of the data for the input frame N is received and, therefore, q/p portion of the first output frame can be calculated based on q/p portion of the data for frame N ⁇ 1 and first q/p portion of the data from frame N.
- the rest i.e., 1 ⁇ q/p portion
- it has to be generated entirely based on the (1 ⁇ q/p) portion of the frame N ⁇ 1.
- the calculation of the data is average (i.e., adding the corresponding pixels' gray levels from the two frames and divided the sum by two).
- 2 ⁇ 3 of the first output frame is obtained by averaging 2 ⁇ 3 of the frame N ⁇ 1 and 2 ⁇ 3 of the frame N+1 (marked as “2 ⁇ 3average (N, N ⁇ 1)) and the remaining 1 ⁇ 3 of the first output frame is obtained solely from 1 ⁇ 3 of the frame N ⁇ 1 (marked as “1 ⁇ 3(N ⁇ 1)).
- the present invention increases the output frame rate up to p/q (p, q are both natural numbers and p>q) times and, in a period of time T equal to the least common multiple of the input and output frame times, q input frames are output and (p ⁇ q) transient frames are generated and inserted at appropriate places before or after the q input frames in the output frame sequence.
- the data for the transient frame can be the result of a function ⁇ (F M ⁇ 1 , F M ) where F M ⁇ 1 is the latest input frame completely received and F M is the input frame currently received.
- ⁇ (F M ⁇ 1 , F M ) F M ⁇ 1
- the present invention can generate one of the following output frame sequences: ⁇ (F N ⁇ 1 , F N ), F N , F N+1 , F N+2 , F N+3 , F N+4 F N ⁇ 1 , ⁇ (F N ⁇ 1 , F N ), F N , F N+1 , F N+2 , F N+3 F N ⁇ 1 , F N , ⁇ (F N , F N+1 ), F N+1 , F N+2 , F N+3 F N ⁇ 1 , F N , F N+1 , ⁇ (F N+1 , F N+2 ), F N+2 , F N+3 F N ⁇ 1 , F N , F N+1 , F N+2 , ⁇ (F N+2 , F N+3 ), F N+3 F N ⁇ 1 , F N , F N+1 , F N+2 , ⁇ (F N+2 , F N+3 ), F N+3 F N ⁇ 1 , F N
- the three additional transient frames can be generated using different functions ⁇ 1 , ⁇ 2 , ⁇ 3 , respectively.
- the present invention does not dynamically change the calculating function or the insertion place of a transient frame. Instead, under pre-determined p and q values and for the (q+1) possible insertion places for the transient frames, the present invention consistently generates a fixed number of transient frame, each using a specific function, and places them at specific insertion places. The increase of the frame rate up to p/q times can be easily achieved by adjusting the clock generation circuit in the control board. The calculation and insertion of the transient frames can be carried out by the firmware of the control board. All these implementation details should be quite straightforward to people of the related art.
- FIG. 3 is a timing diagram showing the input and output frame sequences of FIG. 2 b where the output frame rate is raised up to 1.8 times and the waveforms of various signals when overdriving is integrated.
- the second frame N, the second frame N+1, the second frame N+2, and the second frame N+3 in the output frame sequence are all transient frames and are generated by simple repetition.
- the way to integrate overdriving is, when a “new” output frame is generated that is different from the immediately previous output frame, whether it is a transient frame or not, the pixels of the new output frame are always applied with appropriate overdriving voltages.
- an output frame is identical to the immediately previous output frame
- the pixels of the repeated output frame are applied with their target driving voltages.
- an overdriving voltage denoted as “overdriving code” is applied to the pixel P 1 when the frame N is output for the first time and the target driving voltage is applied in the transient frame where the frame N is output for the second time.
- the waveforms of the pixel P 1 's voltage level and gray level are not shown for the subsequent frames. It has to be pointed out that, even when the transient frames are not produced by repeating the previous output frames, the same principle can still be adopted by applying appropriate overdriving voltages to the pixels of the transient frames.
- the pixel P 1 has target driving voltages marked as “original code” for the input frame N ⁇ 1 and N, and marked as “target code” for the input frame N+1, respectively.
- the present embodiment produces two transient frames before outputting the frame N by repeating the frame N ⁇ 1 two more times and a transient frame before outputting the frame N+1 by repeating the frame once.
- FIG. 4 a What is shown in FIG. 4 a is the simplest way of black insertion and is also the one identical to the conventional approach. That is, the present embodiment always replaces one of every two adjacent output frames, whether it is a transient frame or not, by a black frame. Therefore, as shown by the waveform Vlc, the driving voltage of the pixel P 1 is turned off during these black frames. In this way, a display effect similar to the impulse-typed display device can be achieved and the flickering of the images can be avoided as well. However, these advantages are at the cost of reduced brightness.
- FIG. 4 b is a timing diagram showing the input and output frame sequences where the output frame rate is increased up to 2.5 times and the waveforms of various signals when black-insertion is integrated according to two embodiments of the present invention.
- the two embodiments are specifically applied to scenarios where the transient frames are produced by repetition and the knowledge about the frame data is utilized to decide how to conduct the black insertion.
- there could be two or even three identical output frames e.g., the frame N ⁇ 1 and the frame N+1 of FIG. 4 c ) depending on the ratio of frame rate increase.
- it basically still replaces one of every two adjacent output frames by a black frame.
- the pixels of two consecutive output frames of the three output frame are applied with their target driving voltages. These two frames could the first two as shown in FIG. 4 b or the last two. In this way, the brightness of the LCD device can be improved than simple black insertion.
- the gray level of the pixel P 1 would overshoot past its target gray level as the target driving voltage is applied in two consecutive frames.
- FIG. 4 b applied a driving voltage (denoted as “balance code”) lower than the target driving voltage to the pixels of the second frame of the two consecutive output frames so as to balance the gray level of the pixel P 1 back to its target gray level.
- the brightness of a pixel is determined by the pixel's gray level and the backlight. Therefore, by turning off the backlight behind the pixel during the time its gray level is accelerated to approach the target gray level as shown in FIG. 3 , residuals of dynamic images within these transient processes can be prevented from manifesting themselves.
- black insertion is conducted in FIGS. 4 a and 4 b , the black frames will be “darker” if the backlight is turned off when black frames are output.
- the LCD device will behave more like a CRT display device.
- the aforementioned integration of backlight control with the present invention can be applied to the LED-based direct-lit backlight module shown in FIG.
- a direct-lit backlight module using cold cathode fluorescent lamp (CCFL) tubes as light source.
- CCFL cold cathode fluorescent lamp
- these direct-lit backlight modules are characterized by having horizontal rows of light source (e.g., a row of LEDs or a lamp tube) that can be independently turned or off. Pretty much all LED-based or CCFL-based, direct-lit backlight modules have these characteristics. Please note that the number of scan lines in the LCD panel is not necessarily identical to the number of rows of light source.
- the scan lines of the frame is enabled one by one, each for 1/Hync second, from top to bottom (as pointed out in FIG. 1 b ).
- the pixels of the scan line are all applied with overdriving voltages.
- the gray levels of the pixels of the scan line gradually approach their target gray levels. If the backlight is tuned on, the transient behavior the scan lines' pixels will be manifested. On the other hand, if the backlight is turned off until the scan line is enabled again, the transient behavior will not be accentuated.
- the rows of light source of the backlight module is sequentially turned off. Then, within the 1/108-second frame time for the second output frame N, the rows of light source of the backlight module is sequentially turned on row-by-row again.
- the pixels of every new output frame are applied with overdriving voltages and the pixels of every repeated frame are applied with the target driving voltages.
- the backlight control is further integrated, when there are repeated frames being output as shown in FIG. 3 and for one of repeated frame where overdriving voltages are applied, the rows of the backlight are turned off sequentially and correspondingly to line-by-line enablement of the scan lines. Based on the same principle, for the black frames of FIGS. 4 a and 4 b , the backlight can be turned in the same manner to make them “darker.”
- the method disclosed in the present invention can be implemented in the two modules marked as “frame rate update” and “overdriving timing controller” of the LCD device's control board as shown in FIG. 5 a .
- Some of the logics can also be implemented in a look-up table (LUT) external to the control board.
- the module marked as “Frame memory” is for the temporary storage of the frame data.
- the backlight control it can be implemented in the driver control circuit to the backlight module.
- FIG. 5 a is an application scenario where the method is completely implemented in the panel side while FIG.
- FIG. 5 b shows another scenario where the overdriving and the frame rate increase are implemented as part of the circuit of the LCD device (to the left of the dotted line) and the backlight control is implemented in the driver control circuit in panel side.
- the advantage of the architecture of FIG. 5 b is that, if the backlight control is not implemented, many existing conventional panel (to the right of the dotted line) can be adopted.
- the present invention can also be implemented in various other ways.
- the frame rate increase is implemented in the device-side circuit to the left of the dotted line while the rest of the present invention such as overdriving and backlight control is implemented in the panel-side circuit to the right of the dotted line.
Abstract
Description
ƒ(FM−1, FM)=FM−1
ƒ(FN−1, FN), FN, FN+1, FN+2, FN+3, FN+4
FN−1, ƒ(FN−1, FN), FN, FN+1, FN+2, FN+3
FN−1, FN, ƒ(FN, FN+1), FN+1, FN+2, FN+3
FN−1, FN, FN+1, ƒ(FN+1, FN+2), FN+2, FN+3
FN−1, FN, FN+1, FN+2, ƒ(FN+2, FN+3), FN+3
FN−1, FN, FN+1, FN+2, FN+3, ƒ(FN+3, FN+4),
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070126678A1 (en) * | 2005-12-02 | 2007-06-07 | Ching-Wen Shih | Liquid crystal display |
US20090122034A1 (en) * | 2007-11-13 | 2009-05-14 | Samsung Electronics Co., Ltd. | Display device, and driving apparatus and driving method thereof |
US20090213062A1 (en) * | 2008-02-26 | 2009-08-27 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Color control of a backlighting system |
US20090273553A1 (en) * | 2008-04-30 | 2009-11-05 | Hongsung Song | Liquid crystal display and driving method thereof |
US20120002106A1 (en) * | 2009-06-16 | 2012-01-05 | Sony Corporation | Image display device, image display method, and program |
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Publication number | Priority date | Publication date | Assignee | Title |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040041745A1 (en) * | 2002-08-02 | 2004-03-04 | Li-Yi Chen | Method and appartus for frame processing in a liquid crystal display |
US20060038759A1 (en) * | 2004-08-20 | 2006-02-23 | Samsung Electronics Co., Ltd. | Liquid crystal display and driving method thereof |
US7038651B2 (en) * | 2002-03-20 | 2006-05-02 | Hitachi, Ltd. | Display device |
US20070296655A1 (en) * | 2006-06-22 | 2007-12-27 | Trident Microsystems, Inc. | Method and system for frame insertion in a digital display system |
-
2006
- 2006-09-04 US US11/469,888 patent/US7656374B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7038651B2 (en) * | 2002-03-20 | 2006-05-02 | Hitachi, Ltd. | Display device |
US20040041745A1 (en) * | 2002-08-02 | 2004-03-04 | Li-Yi Chen | Method and appartus for frame processing in a liquid crystal display |
US20060038759A1 (en) * | 2004-08-20 | 2006-02-23 | Samsung Electronics Co., Ltd. | Liquid crystal display and driving method thereof |
US20070296655A1 (en) * | 2006-06-22 | 2007-12-27 | Trident Microsystems, Inc. | Method and system for frame insertion in a digital display system |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070126678A1 (en) * | 2005-12-02 | 2007-06-07 | Ching-Wen Shih | Liquid crystal display |
US8384652B2 (en) * | 2005-12-02 | 2013-02-26 | Chimei Innolux Corporation | Liquid crystal display |
US20090122034A1 (en) * | 2007-11-13 | 2009-05-14 | Samsung Electronics Co., Ltd. | Display device, and driving apparatus and driving method thereof |
US8243002B2 (en) * | 2007-11-13 | 2012-08-14 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling display of images |
KR101509116B1 (en) | 2007-11-13 | 2015-04-06 | 삼성디스플레이 주식회사 | Display device, and driving apparatus and driving method thereof |
US20090213062A1 (en) * | 2008-02-26 | 2009-08-27 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Color control of a backlighting system |
US8358263B2 (en) * | 2008-02-26 | 2013-01-22 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Color control of a backlighting system |
US20090273553A1 (en) * | 2008-04-30 | 2009-11-05 | Hongsung Song | Liquid crystal display and driving method thereof |
US8482503B2 (en) * | 2008-04-30 | 2013-07-09 | Lg Display Co., Ltd. | Liquid crystal display with sequential and reverse sequential scan direction to improve display quality by preventing stains caused by polarization and accumulation of ions, and driving methods thereof |
US20120002106A1 (en) * | 2009-06-16 | 2012-01-05 | Sony Corporation | Image display device, image display method, and program |
US8743279B2 (en) * | 2009-06-16 | 2014-06-03 | Sony Corporation | Image display device, image display method, and program |
US9197847B2 (en) | 2009-06-16 | 2015-11-24 | Joled Inc. | Image display device, image display method, and program |
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